Temporally coincident occurrences of acausal events

Synchronicity is the experience of two or more events which occur in a meaningful manner, but which are causally un-related. In order to be 'synchronistic', the events must be related to one another temporally, and the chance that they would occur together by random chance must be very small.

The idea of synchronicity is that the conceptual relationship of minds, defined by the relationship between ideas, is intricately structured in its own logical way and gives rise to relationships which have nothing to do with causal relationships in which a cause precedes an effect. Instead, causal relationships are understood as simultaneous — that is, the cause and effect occur at the same time.

Synchronous events reveal an underlying pattern, a conceptual framework which encompasses, but is larger than, any of the systems which display the synchronicity. The suggestion of a larger framework is essential in order to satisfy the definition of synchronicity as originally developed by Swiss psychologist Carl Gustav Jung.

Jung coined the word to describe what he called "temporally coincident occurrences of acausal events." Jung variously described synchronicity as an "'acausal connecting principle'" (i.e., a pattern of connection that cannot be explained by conventional, efficient causality), "meaningful coincidence" and "acausal parallelism".